Interstellar Space Clouds Triggered the Ice Ages, Research Suggests

The Pleistocene Epoch--with its glaciers, woolly mammoths, and Neanderthals--still looms large in Earth's rearview mirror, having ended a mere 12,000 years ago. Now, a team of researchers posit that those hundreds of thousands of years of our planet's history may have been chilly due to a cloud in space that briefly...